*{
    margin: 0;
    padding: 0;
}
body {
    background: url("./img/csbg.jpg");
    background-size: 100% 100%;
    background-repeat: no-repeat;
    padding-top: 250px;
    position: relative;
    height:1000px;
}
.bt{
    font-size: 48px;
    letter-spacing: 0.5em; /* 使用像素单位增加间距 */
    max-width: 500px;
    line-height: 80px;
    margin: 0 auto 40px auto;
    text-align: center;
    color: #fff;
    position: absolute;
    left:260px;
    top: 130px;
}
.zs{
    text-align: center;
    line-height: 30px;
    color: red;
}
.user_font{
    max-width: 500px;
    margin: 0 auto 20px auto;
    background-color: rgba(255, 255, 255, 0.5);
    box-shadow:0 0 5px #000;
    border-radius: 10px;
}
.use_data_body div{
    text-indent: 2em; /* 使用em单位设置首行缩进 */
    line-height: 30px;
}
.use_data{
    padding-bottom: 40px;
}
.logo{
    line-height: 50px;
    font-size: 14px;
    text-align: center;
    color: #666;
}